Assemblies of single-walled carbon nanotubes generated by covalent cross-linking with organic linkers

2015 ◽  
Vol 3 (13) ◽  
pp. 6747-6750 ◽  
Author(s):  
Ram Kumar ◽  
C. N. R. Rao
Keyword(s):  
Carbon Nanotubes ◽  
Gas Adsorption ◽  
Single Walled Carbon Nanotubes ◽  
Adsorption Properties ◽  
Cross Linking ◽  
Single Walled Carbon ◽  
Covalently Linked ◽  
Walled Carbon Nanotubes

Assemblies of covalently linked single-walled carbon nanotubes with superior gas adsorption properties have been prepared and characterized.

Covalently-linked Adducts of Single-walled Nanotubes with Biomolecules: Synthesis, Hybridization, and Biologically-Directed Surface Assembly

2002 ◽  
Vol 761 ◽  
Author(s):  
Sarah E. Baker ◽  
Tami L. Lasseter ◽  
Lloyd M. Smith ◽  
Robert J. Hamers
Keyword(s):  
Carbon Nanotubes ◽  
Dna Sequences ◽  
Glass Surface ◽  
High Selectivity ◽  
Single Walled Carbon Nanotubes ◽  
Complementary Dna ◽  
Single Walled Carbon ◽  
Surface Assembly ◽  
Covalently Linked ◽  
Walled Carbon Nanotubes

ABSTRACTCovalently-linked adducts of single-walled carbon nanotubes (SWNTs) with biomolecules have been fabricated. Results are presented here for DNA-SWNT and for biotin-SWNT adducts. DNA-SWNT adducts are shown to be biochemically accessible and to exhibit high selectivity, favoring hybridization with complementary vs. non-complementary DNA sequences. Biotin-SWNT adducts were also prepared and used to direct the assembly of nanotubes onto a biotinylated glass surface.

Effect of Operating Temperature on Characteristics of Single-Walled Carbon Nanotubes Gas Sensor

2005 ◽  
Vol 486-487 ◽  
pp. 485-488 ◽  
Author(s):  
Hong Quang Nguyen ◽  
Mai Van Trinh ◽  
Jeung Soo Huh
Keyword(s):  
Carbon Nanotubes ◽  
Gas Sensor ◽  
Gas Adsorption ◽  
Operating Temperature ◽  
High Sensitivity ◽  
Single Walled Carbon Nanotubes ◽  
Fast Response ◽  
Carrier Gas ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

The effect of operating temperature on characteristics of single-walled carbon nanotubes (SWNT) based gas sensor was investigated. SWNT-based sensor was fabricated from SWNT powder (Iljin Nanotech, Korea) by screen-printing method. SWNT powder (30 mg, AP grade) was dispersed into 0.78 gram a-terpineol (Aldrich) by ultrasonic vibration for 1 hour then stirred manually for 1 hour to increase adhesion. From this condensed solution, a thick film of SWNT was printed onto alumina substrates. The film then was sintered at 300oC for 2 hours to remove residual impurities. Upon exposure to some gases such as nitrogen, ammonia or nitric oxide, resistance of the sensor dramatically changes due to gas adsorption. In our experiments, SWNT-based sensor was employed to detect NH3 gas in N2 ambience. After saturated of N2, the sensor exposes to NH3 with various concentrations (from 5 ppm to 100 ppm, diluted by N2 as carrier gas). This sensor exhibits a fast response, high sensitivity but slow recovery at room temperature. By heating at high temperature and increasing the flow-rate of carrier gas, NH3 gas desorbs easily and recovery of the sensor improved. The heating also influenced the characteristics of sensors such as response and reproducibility. Other special changes in electric property of SWNT-based sensor caused by heating are also discussed.

Single walled carbon nanotubes functionalized with nickel phthalocyanines: effects of point of substitution and nature of functionalization on the electro-oxidation of 4-chlorophenol

2012 ◽  
Vol 16 (01) ◽  
pp. 130-139 ◽  
Author(s):  
Samson Khene ◽  
Tebello Nyokong
Keyword(s):  
Carbon Nanotubes ◽  
Single Walled Carbon Nanotubes ◽  
Current Response ◽  
Single Walled Carbon ◽  
Nickel Phthalocyanine ◽  
Phthalocyanine Complex ◽  
Electro Oxidation ◽  
Covalently Linked ◽  
Walled Carbon Nanotubes ◽  
Hydroxy Groups

In this work we report on electrochemical behavior of nickel phthalocyanine derivatives tetrasubstituted peripherally and non-peripherally with hydroxy and used to modify single walled carbon nanotubes. Nickel phthalocyanine complex octasubstituted at the peripheral positions with hydroxy groups was also used to modify single walled carbon nanotubes. Nickel phthalocyanine complex tetrasubstituted with amino groups at peripheral position was covalently and non-covalently linked to single walled carbon nanotubes. All the conjugates of nickel phthalocyanine derivatives with single walled carbon nanotubes were used for the electro oxidation of 4-chlorophenol. The nickel phthalocyanine octabsubstituted with hydroxy groups at the non-peripheral positions gave the best current response and the best resistance against electrode fouling for the oxidation of 4-chlorophenol.

scholarly journals The Long-Term Fate and Toxicity of PEG-Modified Single-Walled Carbon Nanotube Isoliquiritigenin Delivery Vehicles in Rats

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Bo Han ◽  
Mingming Zhang ◽  
Ting Tang ◽  
Qiusheng Zheng ◽  
Keyu Wang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Molecular Weight ◽  
Single Walled Carbon Nanotubes ◽  
Blood Clearance ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Tissue Sections ◽  
Covalently Linked ◽  
Walled Carbon Nanotubes

Oxidized single-walled carbon nanotubes (o-SWNTs) was modified by covalently and noncovalently linking PEG to the o-SWNTs. The influence of oxidation time, PEG molecular weight, and type of PEG linkage on the blood clearance time of PEG-modified single-walled carbon nanotubes (SWNTs) was investigated. The toxicity profile of SWNTs covalently linked to PEG (c-PEG-o-SWNTs) in rats has also been determined. The pharmacokinetics of c-PEG-o-SWNTs in rats and their distribution in vital organs were monitored by Raman spectroscopy, and the blood clearance of homogenate isoliquiritigenin (ISL) was determined by HPLC. Photos of tissue and tissue sections were taken to evaluate the toxicity of c-PEG-o-SWNTs. We found that SWNTs which were covalently modified with PEG and have a molecular weight of 3500 had the longest blood clearance half-lives. However, SWNTs were toxic to the kidneys and the hearts. The high renal clearance of long-term fate SWNTs may occur because of impaired kidney filtration function. Therefore, we assume that while researchers study the long-term fate of SWNTs, the toxicity of SWNTs also needs to be taken into account.

Influence of Gas Adsorption on Optical Transition Energies of Single-Walled Carbon Nanotubes

Nano Letters ◽  
2008 ◽  
Vol 8 (10) ◽  
pp. 3097-3101 ◽  
Author(s):  
Shohei Chiashi ◽  
Satoshi Watanabe ◽  
Tateki Hanashima ◽  
Yoshikazu Homma
Keyword(s):  
Carbon Nanotubes ◽  
Gas Adsorption ◽  
Optical Transition ◽  
Single Walled Carbon Nanotubes ◽  
Transition Energies ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes
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